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Created page with "{{Night Sky | image = | designation =Rw Cep<br/>HD 21246<br/>HIP 110504 | rightascension =22<sup>h</sup> 23<sup>m</sup> 07.0152<sup>s</sup><ref name=simbad>{{ci..."
{{Night Sky
| image =
| designation =Rw Cep<br/>HD 21246<br/>HIP 110504
| rightascension =22<sup>h</sup> 23<sup>m</sup> 07.0152<sup>s</sup><ref name=simbad>{{cite web|url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=RW+Cephei|title=RW Cephei|accessdate=June 22, 2020|work=Simbad Astronomical Database|publisher=simbad.u-strasbg.fr}}</ref><ref name=Gaia>{{cite journal
|last1=Gaia Collaboration |first1=
|title=VizieR Online Data Catalog: Gaia DR2
|journal=VizieR Online Data Catalog
|volume=I/345
|issue=|page=I/345|date=2018
|doi=
|bibcode=2018yCat.1345....0G
|ref=harv
}} {{arXiv|0708.1752}}</ref>
| declination =+55° 57′ 47.6161″<ref name=simbad/><ref name=gaia/>
| distance =4026.71 ly<ref name=universeguide>{{cite web|url=https://www.universeguide.com/star/110504/rwcephei|title=RW Cephei (Supergiant Star) Star Facts|accessdate=June 22, 2020|publisher=universeguide.com}}</ref>
| constellation =Cepheus
| type =Supergiant{{!}}Supergiant star
| dimensions =
| magnitude =Apparent Mag: +6.44<ref name=universeguide/><br/>Absolute Mag: -3.18 / -4.02<ref name=universeguide/>
| redshift =
| radvelocity =-56.00 ± 5.7 km/s<ref name=simbad/><ref>
{{cite journal
|last1=Kharchenko |first1=N. V.
|last2=Scholz |first2=R. -D.
|last3=Piskunov |first3=A. E.
|last4=Röser |first4=S.
|last5=Schilbach |first5=E.
|last6= |first6=
|last7= |first7=
|last8= |first8=
|last9= |first9=
|display-authors=3
|title=Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of 55000 stars and mean radial velocities of 516 Galactic open clusters and associations
|journal=Astronomische Nachrichten
|volume=328
|issue=9|page=889|date=2007
|doi=10.1002/asna.200710776
|bibcode=2007AN....328..889K
|ref=harv
}} {{arXiv|0705.0878}}
</ref>
| propmotion =RA: -3.616 mas/yr<ref name=simbad/><ref name=gaia/><br/>Dec: -2.349mas/yr<ref name=simbad/><ref name=gaia/>
| parallax =0.2357 ± 0.0944 mas<ref name=simbad/><ref name=gaia/>
}}
'''RW Cephei''' (Rw Cep, HD 21246, HIP 110504) is a [[Supergiant|supergiant star]] in the [[constellation]] of [[Cepheus]].<ref name=universeguide/> It is not part of the constellation itself, but does lie within the borders of Cepheus. The star is one of the largest stars known with a radius nearly 1,600 greater than the [[Sun]]'s.<ref name=space.com>{{cite web|url=https://www.space.com/41290-biggest-star.html|title=What Is the Biggest Star?|accessdate=June 22, 2020|publisher=space.com|author=Nola Taylor Redd|date=July 26, 2018}}</ref> The star is sufficiently bright that it does not require [[binocular]]s or a [[telescope]] to observe it.
RW Cephei is situated roughly 4026.71 [[light year]]s from [[Earth]].<ref name=universeguide/> The star is truly huge, thought to have a radius of 1,535 [[solar radii]] and a mass of 13.7 [[solar mass]]es.<ref name=space.com/> The temperature of the star is thought to be low at 590 kelvin.<ref name=universeguide/> The prefix "RV" in the name identifies RW Cephei as a [[variable star]], meaning its brightness changes over time. It is classified as a pulsating, slow regular variable. The Star slowly expands and contracts over time in a reggular and predictable manner. As it does so, the brightness varies between +6.456 and +6.620 over a period of 0.170 days or four hours.<ref name=universeguide/><ref>{{cite web|url=https://www.universeguide.com/fact/irregularsemiregular#slow|title=Irregular and Semi-Regular Variable Stars|accessdate=June 22, 2020|publisher=universeguide.com}}</ref>
The star is not known to have any [[exoplanet]]s.
==References==
{{reflist}}
{{Stars}}
[[Category:Astronomy]]
[[Category:Stars]]
| image =
| designation =Rw Cep<br/>HD 21246<br/>HIP 110504
| rightascension =22<sup>h</sup> 23<sup>m</sup> 07.0152<sup>s</sup><ref name=simbad>{{cite web|url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=RW+Cephei|title=RW Cephei|accessdate=June 22, 2020|work=Simbad Astronomical Database|publisher=simbad.u-strasbg.fr}}</ref><ref name=Gaia>{{cite journal
|last1=Gaia Collaboration |first1=
|title=VizieR Online Data Catalog: Gaia DR2
|journal=VizieR Online Data Catalog
|volume=I/345
|issue=|page=I/345|date=2018
|doi=
|bibcode=2018yCat.1345....0G
|ref=harv
}} {{arXiv|0708.1752}}</ref>
| declination =+55° 57′ 47.6161″<ref name=simbad/><ref name=gaia/>
| distance =4026.71 ly<ref name=universeguide>{{cite web|url=https://www.universeguide.com/star/110504/rwcephei|title=RW Cephei (Supergiant Star) Star Facts|accessdate=June 22, 2020|publisher=universeguide.com}}</ref>
| constellation =Cepheus
| type =Supergiant{{!}}Supergiant star
| dimensions =
| magnitude =Apparent Mag: +6.44<ref name=universeguide/><br/>Absolute Mag: -3.18 / -4.02<ref name=universeguide/>
| redshift =
| radvelocity =-56.00 ± 5.7 km/s<ref name=simbad/><ref>
{{cite journal
|last1=Kharchenko |first1=N. V.
|last2=Scholz |first2=R. -D.
|last3=Piskunov |first3=A. E.
|last4=Röser |first4=S.
|last5=Schilbach |first5=E.
|last6= |first6=
|last7= |first7=
|last8= |first8=
|last9= |first9=
|display-authors=3
|title=Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of 55000 stars and mean radial velocities of 516 Galactic open clusters and associations
|journal=Astronomische Nachrichten
|volume=328
|issue=9|page=889|date=2007
|doi=10.1002/asna.200710776
|bibcode=2007AN....328..889K
|ref=harv
}} {{arXiv|0705.0878}}
</ref>
| propmotion =RA: -3.616 mas/yr<ref name=simbad/><ref name=gaia/><br/>Dec: -2.349mas/yr<ref name=simbad/><ref name=gaia/>
| parallax =0.2357 ± 0.0944 mas<ref name=simbad/><ref name=gaia/>
}}
'''RW Cephei''' (Rw Cep, HD 21246, HIP 110504) is a [[Supergiant|supergiant star]] in the [[constellation]] of [[Cepheus]].<ref name=universeguide/> It is not part of the constellation itself, but does lie within the borders of Cepheus. The star is one of the largest stars known with a radius nearly 1,600 greater than the [[Sun]]'s.<ref name=space.com>{{cite web|url=https://www.space.com/41290-biggest-star.html|title=What Is the Biggest Star?|accessdate=June 22, 2020|publisher=space.com|author=Nola Taylor Redd|date=July 26, 2018}}</ref> The star is sufficiently bright that it does not require [[binocular]]s or a [[telescope]] to observe it.
RW Cephei is situated roughly 4026.71 [[light year]]s from [[Earth]].<ref name=universeguide/> The star is truly huge, thought to have a radius of 1,535 [[solar radii]] and a mass of 13.7 [[solar mass]]es.<ref name=space.com/> The temperature of the star is thought to be low at 590 kelvin.<ref name=universeguide/> The prefix "RV" in the name identifies RW Cephei as a [[variable star]], meaning its brightness changes over time. It is classified as a pulsating, slow regular variable. The Star slowly expands and contracts over time in a reggular and predictable manner. As it does so, the brightness varies between +6.456 and +6.620 over a period of 0.170 days or four hours.<ref name=universeguide/><ref>{{cite web|url=https://www.universeguide.com/fact/irregularsemiregular#slow|title=Irregular and Semi-Regular Variable Stars|accessdate=June 22, 2020|publisher=universeguide.com}}</ref>
The star is not known to have any [[exoplanet]]s.
==References==
{{reflist}}
{{Stars}}
[[Category:Astronomy]]
[[Category:Stars]]